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draw.c
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draw.c
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/*
* Copyright 2012 Mo McRoberts.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "p_tcg.h"
int
image_clear(image *i, colour *c)
{
int d;
uint64_t n, npixels;
pixel *p;
if(c->format != i->format)
{
errno = EINVAL;
return -1;
}
if(i->viewport)
{
return image_draw_fillrect(i, 0, 0, i->vpwidth, i->vpheight, c);
}
npixels = i->width * i->height;
for(d = 0; d < i->planes; d++)
{
p = i->pixels[d];
for(n = 0; n < npixels; n++)
{
*p = c->p.values[d];
p++;
}
}
return 0;
}
int
image_draw_hline(image *i, uint32_t x, uint32_t y, uint32_t w, colour *c)
{
pixelref ref;
int d;
uint32_t n;
if(c->format != i->format)
{
errno = EINVAL;
return -1;
}
if(image_pixel(i, x, y, &ref) < 0)
{
return -1;
}
if(w > (i->vpwidth - x))
{
w = i->vpwidth - x;
}
for(d = 0; d < i->planes; d++)
{
for(n = 0; n < w; n++)
{
ref.pixel[d][n] = c->p.values[d];
}
}
return 0;
}
int
image_draw_fillrect(image *i, uint32_t x, uint32_t y, uint32_t w, uint32_t h, colour *c)
{
uint32_t n;
for(n = 0; n < h; n++)
{
if(image_draw_hline(i, x, y + n, w, c) < 0)
{
return -1;
}
}
return 0;
}
int
image_draw_bars(image *i, uint32_t x, uint32_t y, uint32_t width, uint32_t height, colour **bars, size_t nbars)
{
uint32_t space, startx, w;
size_t n;
space = (uint32_t) round((double) width / (double) nbars);
startx = x;
for(n = 0; n < nbars; n++)
{
if(n == nbars - 1)
{
w = startx + width - x;
}
else
{
w = space;
}
if(bars[n])
{
image_draw_fillrect(i, x, y, w, height, bars[n]);
}
x += w;
}
return 0;
}
/* Copy up to w pixels from src up to (destx,desty)-(destx+w-1,desty) */
int
image_draw_copyline(image *i, pixelref *src, uint32_t destx, uint32_t desty, uint32_t w)
{
pixelref dest;
int c;
if(destx > i->width || desty > i->height)
{
return 0;
}
if(w + destx > i->width)
{
w = i->width - destx;
}
if(image_pixel(i, destx, desty, &dest))
{
return -1;
}
for(c = 0; c < i->planes; c++)
{
memcpy(dest.pixel[c], src->pixel[c], sizeof(pixel) * w);
}
return 0;
}